import org.junit.jupiter.api.Test;

import java.util.HashMap;

/**
 * @Author: Mai
 * @CreateDate: 2019/11/20 12:08
 * @Description:
 * @UpdateUser:
 * @UpdateRemark:
 * @Version: 1.0
 */
public class test {

    @Test
    void test() {
        HashMap hashMap = new HashMap<String, Boolean>();
        System.out.println(hashMap.get("123"));
    }
}
